diff -Naur Automat-20.2.0.orig/setup.py Automat-20.2.0/setup.py
--- Automat-20.2.0.orig/setup.py        2020-02-17 04:33:10.000000000 +0900
+++ Automat-20.2.0/setup.py     2022-10-31 21:14:14.926665030 +0900
@@ -24,7 +24,6 @@
     package_dir={'automat': 'automat'},
     setup_requires=[
         'setuptools-scm',
-        'm2r',
     ],
     install_requires=[
         "attrs>=19.2.0",
